JPH07122936B2 - Optical information recording medium and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical information recording medium, in particular, a ROM area which is a read-only area in which information is recorded in advance, and information writing at any time or additionally. It is a recordable area that can be performed
The present invention relates to a write-once type optical information recording medium having a RAM area and having compatibility with a compact disc, and a manufacturing method thereof.

(Prior Art) In recent years, as the demand for recording various information signals at a high recording density has increased, it has been possible to improve the information signal quality by using information recording media made based on various constitutional principles and operation principles. Density recording / reproduction has come to be performed,
For example, unevenness corresponding to the information signal is formed on the signal surface of the information recording medium, the information signal is recorded, and the recorded information signal is reproduced by an optical means, or the capacitance value changes. The recording / reproducing apparatus adapted to reproduce by detecting the above has already been put into practical use for recording / reproducing video signals and audio signals.

In order to meet the demand for high-density recording and reproduction in various technical fields, the recording layer of the information recording medium is irradiated with a beam whose intensity is modulated by the information signal, so that the recording layer of the information recording medium responds to the information signal. Studies have also been conducted on information recording media in which information signals are recorded by causing physical changes or chemical changes, but in recent years, it has become easier to obtain semiconductor lasers that operate stably. As a result, various optical recording media (hereinafter also referred to as optical discs) capable of high-density recording / reproduction using laser light have already been put into practical use, or have been put into practical use. It is well known that research and development are currently underway.

That is, a recorded optical disk (playback-only optical disk) that is reproduced in large quantities from an original disk on which information signals are recorded by pits formed as geometrical recesses or projections is, for example, a video disk or a compact disk. In addition to the fact that it is beginning to spread to general households, 1
Optical discs (write-once optical discs) that can be additionally recorded by a user only once, erasable optical discs, and the like are being actively researched and developed for practical use in, for example, office file memories and other applications.

By the way, a compact disc known as one of the information recording media in which information signals are recorded at a high density due to the arrangement of pits corresponding to the information signals on the signal surface of the information recording medium is An information signal is recorded on the signal surface by an array of pits having a depth set in a specific relation to the wavelength, and the entire signal surface is covered with a thin film of aluminum or the like. Therefore, the reflectance of the land portion on the signal surface is set to 70% to 90% with respect to the light having the wavelength of 780 nm, and when reading the information signal from the signal surface of the information recording medium, the wavelength is It is done with a spot of 780 nm light.

Then, when reading an information signal from the compact disc, the amount of reflected light from the pit portion on the signal surface of the compact disc causes the amount of reflected light from the land portion as a result of light interference occurring at the pit portion. It is performed by making use of the fact that the amount of light is smaller than the amount of light, and tracking error information also uses the difference between the amount of light reflected from the recorded mark and the amount of light reflected from the land. It is supposed to be obtained.

Now, with the spread of the compact discs described above, as an optical disc compatible with a compact disc that can be played back using a compact disc player, for example, a prerecorded area dedicated to playback (hereinafter, ROM area (sometimes referred to as read-only memory area ...) and recording area that can be used as a write-once optical disk (hereinafter referred to as RAM area ... random acques memory area ...) Various proposals have been made for a write-once type optical disc having a configuration mode provided with the above) or an optical disc having a recording area on the entire surface. The disk has a structure in which a tracking guide groove is provided on a transparent substrate so that tracking control is performed even during recording.

By the way, as an optical disc that is compatible with compact discs,
Playback standards established for discs,
That is, it must satisfy the standard values for reflectance, modulation of high frequency signals, symmetry of high frequency signals, tracking signal output, crosstalk, etc. When trying to obtain a write-once type optical disc having power compatibility, various standards relating to reproduction on a compact disc that are particularly problematic include reflectance, high-frequency signal modulation, tracking signal output, and the like. .

Here, in the case of constructing a write-once optical disc compatible with a compact disc, various standards relating to the reflectance, the modulation degree of a high frequency signal, the tracking signal output, etc. which are prescribed for the compact disc. The problem that occurs when a write-once optical disc that can satisfy the above conditions is constructed will be outlined below.

First of all, the standard value for the reflectance of compact discs is to have a reflectance of 70% or more when viewed from the reading side of the optical disc when laser light with a wavelength of 780 nm is incident from the reading side of the optical disc. However, since a reflection loss of about 8% occurs on the surface of the optical disk, it is necessary to consider the reflection loss on the surface of the optical disk only in order to set the reflectance on the reading side of the optical disk to 70% or more. , The reflectance of the metal reflective film is at least
80% or more will be required.

It is well known that a compact disc uses an aluminum reflective film having a reflectance of 80% or more and satisfies the above-mentioned standard value of reflectance.

However, in the write-once type optical disc, when recording is performed on the recording film, the recording film absorbs energy for recording, and as described above, the write-once type optical disc is used for tracking control during recording. In addition, since a guide groove for tracking control is provided on the transparent substrate, a light amount loss due to the incident light being diffracted by the guide groove is also added, so that the reflectance on the read side of the optical disk is reduced. It has been conventionally difficult to obtain the standard value of the reflectance in.

Further, when a write-once type optical disc compatible with a compact disc is to be constructed, the write-once type optical disc that can satisfy the standard for the modulation degree of the high frequency signal defined for the compact disc is constructed. In this case, there are the following problems.

That is, since the information signal is read out using the diffraction of light by the pit in the compact disc, it is easy to meet the standard value for the modulation degree of the high frequency signal, but it has been proposed in the past. In a general write-once optical disc, the recording mode on the recording film is, for example, due to perforation or phase change, and the recorded information signal is read by changing the reflectance. Therefore, the difference between the light reflectance of the land and the light reflectance of the recording portion (corresponding to the pit) due to the phase change or the phase change, that is, the modulation degree of the high frequency signal is small, It was not possible to meet the standard for the modulation degree of high-frequency signals specified for compact discs.

In order to satisfy the standard value of the compact disc for the modulation of the high frequency signal, even in the case of the write-once optical disc, the information signal is read using the diffraction of light by the pits. Similarly, it may be necessary for the phase structure to allow the reading of the information signal.

Next, when a write-once optical disc compatible with a compact disc is to be constructed, a write-once optical disc capable of satisfying the standard for the output level of the tracking signal specified for the compact disc is constructed. When doing, there are the following problems.

That is, the output level of the tracking signal on the optical disc is determined by the phase structure that is determined by the shape of the pit or the tracking guide groove formed on the transparent substrate, but the write-once optical disc also satisfies other characteristics. In addition, it is necessary to make the output level of the tracking signal satisfy the standard value.

However, in the case of a general write-once type optical disc that has been conventionally proposed, when the recording mode on the recording film is performed by, for example, making a hole, the shape of the guide groove for tracking is determined by the hole. Since the phase structure is disturbed, it is difficult to obtain a tracking signal having a desired output level.

From the above description, when constructing a write-once optical disc compatible with a compact disc, various characteristics such as light reflectivity during reproduction, modulation of high frequency signal, output of tracking signal, etc. should be taken into consideration when the compact disc is used. There are many problems in satisfying the standard stipulated in the above, and it was difficult to provide a write-once optical disc compatible with a compact disc by using a conventional write-once optical disc. .

FIG. 5 is a vertical cross-sectional view of an example configuration of an optical recording medium disc disclosed in Japanese Patent Laid-Open No. 132656/1990. This optical recording medium disc has tracking guide grooves G, G ... Provided transparent substrate made of, for example, polycarbonate resin
A metal film 12 for light reflection in the ROM area, which is a read-only area, and a protective film made of, for example, an ultraviolet curable resin are provided on the board surface on which the guide groove G for tracking in 10 is provided.
13 is sequentially adhered, and in the RAM area which is the recordable area, a recording laser beam having a predetermined wavelength is formed on the plate surface of the transparent substrate 10 on which the guide groove G for tracking is provided. When irradiated with, the organic material film 11 absorbs an appropriate amount of the laser light and changes its refractive index (hereinafter, also referred to as the organic material recording film 11)
Then, a metal film 12 for light reflection and a protective film 13 made of, for example, an ultraviolet curable resin are sequentially attached.

The ROM area of the above-mentioned optical recording medium disc is the same as the configuration of a normal compact disc, and its reproducing operation is well known.

Further, the RAM area in the above-mentioned optical recording medium disk is on the board surface of the transparent substrate 10 provided with the tracking guide grooves G, G. When irradiated with a recording laser beam having a predetermined wavelength, the organic material recording film 11 attached to the transparent substrate 10 absorbs an appropriate amount of the laser beam and the refractive index changes. To do.

Then, the tracking guide grooves G, G on the transparent substrate 10 in the laser light incident from the side of the board where the guide grooves G, G for tracking on the transparent substrate 10 are not provided. Compared with the phase difference obtained in the absence of the organic material recording film 11 described above, the phase difference generated between the part and the part of the transparent substrate 10 other than the guide grooves G for tracking G, G ... Reduced due to the change in the optical path length due to the difference in the film thickness of the material recording film 11, the substantial phase difference of the laser light becomes smaller than the value of the phase difference determined by the groove shape in the transparent substrate 10,
Further, due to the advance of the phase caused by the change of the organic material recording film 11 in the recorded portion, the optical phase of the laser beam in the recorded portion is substantially advanced as compared with the actual recorded portion. Enables compatibility with optical recording medium discs, that is, compact discs, in which characteristics such as light reflectance during playback, modulation of high-frequency signals, and output of tracking signals can meet the standards stipulated for compact discs. It is possible to provide a write-once type optical disc having the above.

(Problems to be Solved by the Invention) By the way, in a write-once optical disc having compatibility with the already proposed compact disc having the ROM area which is the reproduction-only area and the RAM area which is the recordable area, , Transparent substrate 1 in ROM area as shown in FIG.
The metal film 12 for light reflection and the protective film 13 made of, for example, an ultraviolet curable resin are sequentially adhered to the board surface on which the guide groove G for tracking in 0 is provided, whereas the RAM area In the above, the organic material recording film 11, the light reflecting metal film 12, and the protective film 13 made of, for example, an ultraviolet curable resin are provided on the board surface of the transparent substrate 10 on which the tracking groove G is provided. Since the structure is such that the organic material recording film 11 is formed by applying the spin coat method only on the transparent substrate 10 corresponding to the ROM area in manufacturing it, the ROM area is not formed in the ROM area. Since it is necessary to prevent the organic material recording film 11 from being formed, for example, a track pitch of 500
The ROM area and the R area are separated by a space having a very large size (1 to 1500 times) (the portion illustrated by reference numeral 14 in FIG. 5).
Since it is required to be provided between the optical disc and the AM area, there is a drawback that the total recording capacity of the optical recording medium disc is reduced.

When the organic material recording film 11 is formed by applying the spin coating method as described above, the ROM area is provided in the inner peripheral portion of the optical recording medium disk, and the RAM area is provided in the outer peripheral portion rather than the ROM area. In addition to the restriction that it is necessary to provide the optical recording medium disk, it is impossible to make an optical recording medium disk in which a plurality of RAM areas and a plurality of ROM areas are mixed.

On the other hand, as a solution of these problems, a recording layer made of an organic material is formed over the entire area of a ROM area which is a read-only area and a RAM area which is a recordable area as Japanese Patent Application No. 2-36190 from the applicant company. Have filed an optical disc compatible with compact discs.

FIG. 4 is a side sectional view showing an example of the structure of the optical disc. In the figure, the same parts as those of the related art are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 4, G ₀ is a pit constituted by an information signal in the ROM area, and Ga is a guide groove for tracking provided in the RAM area.

The width of the pit G _{0 and} the width of the tracking guide groove Ga are the width of the pit G _{0 in} the direction orthogonal to the extending direction of the recording trace (track) on the optical recording medium disk, and the tracking guide. It is the width of the groove Ga.

The transparent substrate having the pit G ₀ in the ROM area and the tracking guide groove Ga in the RAM area.
An organic material recording film 11 whose refractive index changes by absorbing an appropriate amount of a recording laser beam having a predetermined wavelength (for example, a wavelength of 780 nm) in all areas of the ROM area and the RAM area on the surface 10
Are formed by applying the spin coating method. The organic material recording film 11 is, for example, a heat mode optical recording material, a photon mode optical recording material, or both a heat mode and a photon mode, which uses an organic dye or a material in which an organic dye is dispersed in an organic material. It is possible to use an organic optical recording material selected from an optical recording material using an organic dye that operates in a mode or a material in which an organic dye is dispersed in an organic material, for example, in a state where a laser beam for recording is not irradiated. For example, a cyanine-based organic dye material having a refractive index n of +2.65 in the real part and −0.05 in the imaginary part can be used.

12 is a metal film for light reflection provided on the above-mentioned organic material recording film 11 by applying, for example, a vapor deposition method or a sputtering method, and the metal film 12 has a high reflectance, for example, Au, Al,
It is made of a metal such as Cu or an alloy having a high reflectance.

Reference numeral 13 is a protective film provided on the metal film 12 and made of, for example, an ultraviolet curable resin.

According to the configuration of FIG. 4, the ROM area and the RAM area can be freely mixed, the decrease in recording density can be prevented, and the spin coating method can be used as it is. The setting of the liquid dropping position is also easy.

However, this structure has a problem that it is difficult to adjust the groove depth of the RAM area during mastering because the pit depth of the ROM area and the groove depth of the RAM area are different.

The present invention has been made in view of such a point, a high productivity spin coating method can be applied, and since a reflective layer is provided in advance also during spin coating, the boundary between the pit portion and the groove portion is Therefore, it is an object of the present invention to provide a highly reliable optical information recording medium which is clear and does not cause a reduction in recording density, and a manufacturing method thereof.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and as a first invention, a read-only area and a recordable area are provided on the same surface of an optical information recording medium. An optical information recording medium having: a recording layer formed only in the recordable area, and a first reflective layer formed only in the read-only area,
On the second reflective layer, a second reflective layer continuously formed of a material different from that of the first reflective layer on the recording layer and the reproducible area so as to include the read-only area and the recordable area. An optical information recording medium comprising a protective layer formed on the optical information recording medium, and as a second invention, an optical information recording medium having a read-only area and a recordable area on the same surface of the optical information recording medium. A manufacturing method, comprising: forming a first reflective layer only in the read-only area; forming a recording layer only in the recordable area; and including a reflective layer formed in the read-only area. It comprises a step of forming a second reflective layer made of a material different from that of the first reflective layer on the recording layer formed in the recordable area, and a step of forming a protective layer on the second reflective layer. A method for manufacturing an optical information recording medium is provided.

(Example) FIG. 1 is a vertical sectional view of an optical information recording medium according to the present invention, and FIGS. 2 (A) to 2 (E) are vertical sectional views showing the manufacturing process thereof.

In FIG. 1, reference numeral 1 denotes a transparent substrate made of, for example, a polycarbonate resin. For example, in the main surface of the transparent substrate 1 having a diameter of 120 mm, a ROM area having a radius of 25 mm to 35 mm has a CD of 110 nm depth.
-The pit G _{0 of the} ROM signal is formed according to the desired information. In addition, the RAM area with a radius of 35 mm to 58 mm has a depth of 110
Guide groove for tracking that is absolute time modulated by a wobbling with a width of 0.5 nm, a width of 0.5 μm and a pitch of 1.6 μm and an amplitude of 30 nm.
Ga is formed.

The transparent substrate 1 on which the pit G ₀ in the ROM area and the guide groove Ga for tracking in the RAM area are provided
When a recording laser beam having a predetermined wavelength (for example, a wavelength of 780 nm) is irradiated on the RAM area of the surface of the organic material recording film, the refractive index changes by absorbing an appropriate amount of the laser beam. (Hereinafter, it may be simply referred to as a recording layer.) 2
Are formed by spin coating.

As the organic material recording film 2, an indolenine cyanine dye represented by the general formula shown in FIG. 3 is used.

In the formula, R2, R3, R4, R5 are either CH3 ＝, C2H5 ＝, R
1, R4 is a C1-C5 alkyl group, and may be R1 = R4 or R1 ≠ R4. In addition, X ⁻ represents an anion, for example, I ⁻ , Br ⁻ , C
lO4 ^-, SbF6 ^- it is. When forming the organic material recording film 2, first, the RAM area is masked with a mask 1a formed of a metal or resin material described later so that it does not enter the ROM area, and then the ROM area. On the pit G ₀ which is, for example, a film of Al to be the first reflective layer 3 is formed to a thickness of 30 to 70 nm by a sputtering method, and then the mask 1a is RA.
The organic material recording film 2 is formed on the RAM area after being removed from the M area.

The first reflective layer is not limited to Al, but may be, for example, Cr or Ni that is a material having a similar reflectance in the semiconductor laser wavelength region.

Here, a method of attaching the indolenine cyanine dye by spin coating will be described.

First, the indolenine cyanine dye as described above,
Dissolve 6% by weight concentration in diacetone alcohol to prepare a coating solution for recording layer.

Then, the coating solution is dripped near the boundary between the reflective layer and the recordable area on the transparent substrate 1 from the inner peripheral side thereof,
The transparent substrate 1 is rotated at 1500 to 3000 rpm and shaken off, and the recording layer 2 having a thickness of, for example, 50 to 200 nm is formed on a predetermined RAM area.
Is formed by coating.

When the recording layer 2 is formed, the first reflective layer 3 is previously provided on the ROM area, so that it does not enter the ROM area.

Then, after the recording layer 2 is dried, the entire area of the ROM area and the RAM area is a pit G ₀ in the ROM area which is the reproduction-only area and the recordable area and covers the entire surface of the organic material recording film 2. For example, a metal film 4 for light reflection (hereinafter, also simply referred to as a reflection layer) 4 is attached by applying, for example, a vapor deposition method or a sputtering method.

The metal film 4 for light reflection is made of a metal having a high reflectance in the semiconductor laser wavelength region, such as Au, Al,
A metal such as Ag or Cu or an alloy having a high reflectance is used, but in this embodiment, a reflective layer made of Au is deposited to a thickness of 50 to 70 nm.

5 is, for example, an ultraviolet curable resin monomer provided over the entire upper surface of the metal film 4 is formed into a film having a thickness of, for example, 2 to 5 μm by a spin coating method, and further cured by ultraviolet irradiation. It is a protective film formed by tearing.

In this case, if the outer peripheral side end portions of the recording layer 2 and the reflective layer 4 and the outer peripheral side end portions of the reflective layer 3 and the reflective layer 4 are respectively covered with the protective layer 5, the protective layer 5 causes the recording layer The protective layer 5 is formed while 2 and the like are dissolved and removed. Therefore, since the protective layer 5 reaches the transparent substrate 1 and the entire recording layer 2, the reflective layer 3, and the reflective layer 4 are covered with the protective layer 5, the transparent substrate 1 and the protective layer 5 are combined. The adhesion is extremely good.

When this optical disk was played back with an appropriate CD player, the ROM area was left as it was with a normal CD.
I was able to play it as well.

Moreover, when the C1 error rate, symmetry, modulation degree, and the like of the reproduced signal at this time were measured, the CD standard was satisfied in all cases. In the RAM area, the recording power is 7.0-9m using the laser light of wavelength 780nm.
As a result of trying to record the EFM-modulated signal with W, the recording was satisfactorily performed, and the CD player could reproduce the same as the ROM area.

Next, a manufacturing method of the optical information recording medium shown in FIG. 1 will be described with reference to FIGS.

For example, in the center of the transparent substrate 1 in which a tracking guide groove having a pitch of 1.6 μm is formed, a hole having a predetermined diameter is formed as well known, although not shown.

The diameter of the transparent substrate 1 is 120 mm, for example, and polycarbonate is used as the material thereof.

Of the main surface of this transparent substrate 1, ROM with a radius of 25 mm to 35 mm
A pit G ₀ of a CD-ROM signal having a depth of 110 nm is formed in the area according to desired information.

In the RAM area with a radius of 35 mm to 58 mm, the depth is 110 nm and the width is
The wobbling with an amplitude of 30 nm at a pitch of 0.5 μm and a pitch of 1.6 μm forms an absolute time-modulated tracking guide groove Ga. (FIG. 2 (A)) First, a metal or resin mask 1a is applied on the RAM area of the transparent substrate 1, and Al is deposited to a thickness of 30 to 70 nm only on the pit G ₀ portion of the ROM area by the sputtering method. The first reflective layer 3 is formed. (FIG. 2 (B)) After this Al film formation, the metal or resin mask 1a is removed from the RAM region.

Next, an indolenine cyanine dye represented by the general formula shown in FIG. 3 is formed in the RAM region by a spin coating method, which is performed by the following method.

That is, an indolenine-based cyanine dye is dissolved in diacetone alcohol in a concentration of 6% by weight, and the dissolved coating solution for recording is dripped near the boundary between the first reflective layer 3 and the recordable area from the inside thereof. Then, rotate the transparent substrate 1 at 1500-3000 rpm to shake off the solution,
For example, the recording layer 2 is formed by coating so as to be thicker than the first reflective layer 3 on the region. (FIG. 2 (C)) The recording layer 2 is dried after coating.

After drying, 50% Au was sputtered on all of the upper portions where the first reflective layer 3 and the recording layer 2 were formed.
The second reflective layer 4 is formed by depositing it to a thickness of 70 nm. (FIG. 2 (D)) Next, an ultraviolet curable resin monomer is applied by spin coating so as to cover the entire main surface of the transparent substrate 1 on which the second reflective layer 4 is formed as described above, Approximately 5 μm by photo-crosslinking polymerization and curing by UV irradiation with a UV lamp
The protective layer 5 is formed (FIG. 2 (E)) (Comparative Example 1) Next, Comparative Example 1 was prepared to compare the characteristics.

In Comparative Example 1, a dye solution similar to that in the example was dropped at a position having a radius of 40 mm on the transparent substrate 1 used in the example, and a recording layer was formed only in the RAM region by spin coating. According to the same method as in the example, an optical disk was obtained by sequentially laminating a reflective layer and a protective layer. According to this, the position of the boundary R = 35 mm between the pit portion and the groove portion is correctly defined as the recording layer boundary. However, it was difficult to obtain a product having a good appearance.

The optical disc of this comparative example was reproduced by a CD player in the same manner as the example, but the obtained signal was out of the CD standard in symmetry and mag, and a good result was not obtained.

(Comparative Example 2) In Comparative Example 2, a pit having a depth of 115 nm is formed in a ROM area having a radius of 25 to 35 mm on the transparent substrate 1 used in the above-described embodiment, and a RAM area having a radius of 35 to 58 mm. Has a depth of 60 nm and a width of 0.
An absolute time-modulated tracking guide groove having a pitch of 5 μm and a pitch of 1.6 μm is formed, a recording layer is formed on the entire circumference by the spin coating method as in the above embodiment, and thereafter, a reflective layer and a protective layer are sequentially laminated. I got an optical disc, but this one
The ROM part satisfied the standard, but the RAM part did not record / reproduce normally.

(Other Embodiments) In the embodiments of the optical information recording medium and the manufacturing method thereof according to the present invention, the thickness of the recording layer provided on the RAM area is explained to be larger than that of the ROM area. It is not necessary to do so, and it is sufficient if it is within the range of the above embodiment. Further, according to the present invention, the pits in the ROM area, which is a read-only area, and the tracking groove depth in the RAM area, which is a recordable area, are the same.
It is possible to easily set conditions for pit formation and tracking groove formation at the time of mastering, and there is an effect that compatibility with CD is good.

(Effects of the Invention) As described in detail above, according to the optical information recording medium and the method for manufacturing the same of the present invention, the recording layer is formed only in the recordable area, so that it is less susceptible to the photobleaching of the dye, Further, since the two reflective layers also have the same reflectance as each other, the change in reflectance can be small and a highly reliable optical disc of this type can be obtained and produced. The spin coat method with high property can be applied, and moreover,
The boundary between the pit and the groove is clear, there is no decrease in recording density, the read-only area has the same structure as a normal read-only optical disk, and the recordable area is the same as a normal recordable disk. Since the recording / reproducing characteristics are also good, it has great practical value such as being easily compatible with ordinary CDs.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an optical information recording medium according to the present invention, FIGS. 2 (A) to (E) are the process diagrams of the optical information recording medium, and FIG. The chemical formulas of indolenine cyanine dyes used in Examples are shown in FIG. 4 and FIG.
FIG. 6 is a vertical sectional view of an optical information recording medium as a conventional example. 1 ... Transparent substrate, 2 ... Recording layer, 3 ... First reflective layer, 4 ... Second reflective layer, 5 ... Protective layer.

Claims (2)

[Claims] 1. An optical information recording medium having a read-only area and a recordable area on the same surface of the optical information recording medium, the recording layer being formed only in the recordable area, and the read-only area. A first reflective layer formed only in the area, and a first reflective layer continuously formed on the recording layer and the read-only area so as to include the read-only area and the recordable area with a material different from that of the first reflective layer. An optical information recording medium comprising a second reflective layer and a protective layer formed on the second reflective layer. 2. A method for manufacturing an optical information recording medium having a read-only area and a recordable area on the same surface of the optical information recording medium, wherein a first reflective layer is formed only in the read-only area. The step of forming a recording layer only in the recordable area, and the first reflection layer on the recording layer formed in the recordable area including the first reflective layer formed in the read-only area. A method of manufacturing an optical information recording medium, comprising: a step of forming a second reflective layer made of a material different from that of the layer; and a step of forming a protective layer on the second reflective layer.